Nil means there are no comments. The diary does not display
parts of entries that are inside comments. You can use comments
for whatever you like, e.g. for meta-data that packages such as
-`appt.el' can use. Comments may not span mutliple lines, and there
+`appt.el' can use. Comments may not span multiple lines, and there
can be only one comment on any line.
See also `diary-comment-end'."
:version "24.1"